28478323 has 2 divisors, whose sum is σ = 28478324. Its totient is φ = 28478322.

The previous prime is 28478311. The next prime is 28478339. The reversal of 28478323 is 32387482.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28478323 is a prime.

It is a super-2 number, since 2×28478323² = 1622029761784658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28478423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14239161 + 14239162.

It is an arithmetic number, because the mean of its divisors is an integer number (14239162).

Almost surely, 2^28478323 is an apocalyptic number.

28478323 is a deficient number, since it is larger than the sum of its proper divisors (1).

28478323 is an equidigital number, since it uses as much as digits as its factorization.

28478323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 37.

The square root of 28478323 is about 5336.5085027572. The cubic root of 28478323 is about 305.3782747179.

The spelling of 28478323 in words is "twenty-eight million, four hundred seventy-eight thousand, three hundred twenty-three".